It doesn't work. How can I configure the Smart Pi as access point, preferably that it acts like hotspot?

Q2: How can I configure the Smart Pi's ethernet interface with fixed IP address?

Q3: Is the max. size of Sqlite database set somewhere, so that it automatically purges the old records?

Wishlist:
Logging of all possible measurements and calculations can be a burden for the SD card. I would like to monitor just voltage and current on a single phase system. It would be a nice feature to configure what measurements you would like to log - could be also a compiler directive. So that the built application creates a database of interested elements only, as well the CSV export.

If I want make changes on the smartpi's open source code, how would I go forward on this?
Do I download the open source code to the SmartPi and make the changes there with an GO IDE for RPI and then build it,
or is it easier to download the source code and make the changes with a GO IDE on a for example windows machine and then remotley update the SmartPi with the new code?